Search found 279 matches

by Dui, ni shuo de dui
Jun 17 2019 2:06am
Forum: Stand-up E-scooters and E-skateboards
Topic: Winter Project... Design and Build an eScooter
Replies: 32
Views: 1400

Re: Winter Project... Design and Build an eScooter

Sweeet! Great build, and I bet it should run very well. The only little remark I would make is the size of the main connector attached to the copper busbar, it seems a little undersized compared to the rest. But I don't know how many amps you plan on pulling through it, so that might be ok. Anyways,...
by Dui, ni shuo de dui
Jun 17 2019 12:45am
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 340
Views: 14462

Re: APL's DIY axial-flux motor

While your motor is still opened, take a little time to make sure your magnets fields are correctly oriented, just in case.
by Dui, ni shuo de dui
Jun 16 2019 10:46pm
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: YZF600R Thundercat EV
Replies: 134
Views: 28834

Re: YZF600R Thundercat EV

Nice progress!
Just, could you post bigger pictures? We can't really see much :(
by Dui, ni shuo de dui
Jun 16 2019 10:22pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Build Options
Replies: 13
Views: 271

Re: Build Options

three vendors have a 17" in the 3-5kw versions. I'm leaning towards the NBPower 5kw kit but also looked into the QS. If you're going to build 3kw and the 5kw is not much more why not? if 72v/32Ah is a minimum it is what it is. the NB hub comes with a 100A sine wave programmable controller but I'll ...
by Dui, ni shuo de dui
Jun 14 2019 12:56am
Forum: E-Scooter and Motorcycle General Discussion
Topic: Build Options
Replies: 13
Views: 271

Re: Build Options

That looks like a sweet, lightweight ride. What I would do: -remove the current subframe and build another one that goes to the bottom: This way you'd have lots of space for a big battery and no need to build it in a weird shape. -Find a way to remove the rubbish front brake, in order to replace it ...
by Dui, ni shuo de dui
Jun 13 2019 9:31pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 340
Views: 14462

Re: APL's DIY axial-flux motor

As far as cutting the plates, there has been some previous discussion about it back around page 11 or so. It keeps coming up, but the current plan is to cut an 'L' in the side of the slot, and place a non ferrous pin into a hole drilled in the cut, as a lock of sorts. The second solution seem like ...
by Dui, ni shuo de dui
Jun 13 2019 5:04am
Forum: Battery Technology
Topic: Which cell for long lasting battery
Replies: 32
Views: 738

Re: Which cell for long lasting battery

It seems to me like you didn't really test each cell, did you?
Are you sure that there is not one weak paralleled group?

Could be that you just got one or a few bad cells and that the rest is fine, so the BMS shuts down/indicates a low SOC because of these while the rest is still fine.
by Dui, ni shuo de dui
Jun 12 2019 9:52pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 340
Views: 14462

Re: APL's DIY axial-flux motor

Thanks Dui, ni shuo de dui. Spacers are 1/2" flat stock, and I used a large end mill and just plunge cut the pieces in the vice. Mostly eyeballed it, and massaged it as I went. A couple of chamfers on the tops, and a bit of belt sanding. The only really precise cuts were the length of the spacers, ...
by Dui, ni shuo de dui
Jun 12 2019 8:23pm
Forum: Motor Technology
Topic: RC ESCs in a real size motorbike? How stupid would that be?
Replies: 7
Views: 199

Re: RC ESCs in a real size motorbike? How stupid would that be?

It doesn't have hall sensors. Sensorless startup on a hub with high power will probably blow it quickly. Good point, I didn't pay attention to that. It won't have good power handling capability. Look at the physical size. Not all controller regimes are that efficient. Even at 95% efficiency it stil...
by Dui, ni shuo de dui
Jun 12 2019 4:22am
Forum: Motor Technology
Topic: RC ESCs in a real size motorbike? How stupid would that be?
Replies: 7
Views: 199

Re: RC ESCs in a real size motorbike? How stupid would that be?

If it's like the rest of the RC controllers people have used on here, big or small, they don't like high startup loads for very long, and don't usually have any way to actually monitor what's going on and react to it, so they blow up on startup. Not always the frist time, but eventually. That's wha...
by Dui, ni shuo de dui
Jun 12 2019 1:03am
Forum: Motor Technology
Topic: RC ESCs in a real size motorbike? How stupid would that be?
Replies: 7
Views: 199

RC ESCs in a real size motorbike? How stupid would that be?

Hi guys, I came across this thing, which is a ESC for hobby remote controlled race boats or surfboards: https://www.aliexpress.com/item/32693130599.html?storeId=513485&spm=2114.12010612.8148356.53.51fd57c3ih4PQ3 800A per phase, apparently a 1000A/phase version exists too integrated BMS Programmable ...
by Dui, ni shuo de dui
Jun 11 2019 10:50pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 340
Views: 14462

Re: APL's DIY axial-flux motor

Absolutely stunning work, kudos! I'm particularly impressed with the spacers, I wonder how you machined them. They look really beautiful. Too bad it doesn't work just yet, but I'm sure you will figure it out soon. I was wondering, aren't the aluminum plates on which are mounted the coils interract w...
by Dui, ni shuo de dui
Jun 11 2019 5:18am
Forum: Motor Technology
Topic: Can Flux Weakening mess with the hall sensors?
Replies: 5
Views: 147

Re: Can Flux Weakening mess with the hall sensors?

Thanks guys, your explanations seem to make sense. I'm using the flux weakening on this controller (sabvoton 72200 unlocked) for now around two years without any issue. It was set to something like 40 amps. Top speed was around 117kmh. I just moved it a up quite a lot recently, probably around 80 am...
by Dui, ni shuo de dui
Jun 10 2019 2:21am
Forum: E-Vehicles General Discussion
Topic: Tesla expects global shortage of electric vehicle battery minerals
Replies: 25
Views: 698

Re: Tesla expects global shortage of electric vehicle battery minerals

Most of you guys seem to miss a quite important point: all the quantities you mention are actually "theoretical exploitable resources considering today's extraction technologies and cost of said extraction". So basically, that's extremely far from the actual quantity of available material on earth. ...
by Dui, ni shuo de dui
Jun 10 2019 1:18am
Forum: Motor Technology
Topic: Can Flux Weakening mess with the hall sensors?
Replies: 5
Views: 147

Can Flux Weakening mess with the hall sensors?

Hello guys, I recently started to have a weird issue with my motorbike. Sometimes, when running at high speeds, the bike will suddently have what feels like a big burst of regen braking, then the controller would cutoff. This happens when I have the throttle either wide opened or slightly accelerati...
by Dui, ni shuo de dui
Jun 10 2019 12:00am
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: Yamaha FZR-8000 Genesis
Replies: 18
Views: 1007

Re: Yamaha FZR-8000 Genesis

Awesome, you can squeeze a "reliable" 40hp from a motor rated for 10.7hp... but you put it in a 145hp (stock) chassis? "Rad". I really don't understand why you're spending so much time bitching on every single project. Isn't the point of this forum to do Electric conversions or did I miss something...
by Dui, ni shuo de dui
Jun 09 2019 11:20pm
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: Yamaha FZR-8000 Genesis
Replies: 18
Views: 1007

Re: Yamaha FZR-8000 Genesis

8000W is almost 11hp. Why start with a bike that had 145hp? I know it's a cool bike, but that's like putting a golf cart motor in a Formula One car. You obviously don't get how power ratings on those motors work. To be fair, no one really does :lol: They can deliver more than 30KW reliably. On a fr...
by Dui, ni shuo de dui
Jun 09 2019 10:13pm
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: Yamaha FZR-8000 Genesis
Replies: 18
Views: 1007

Re: Yamaha FZR-8000 Genesis

That seems like a solid design now. I guess it's time to get your hands dirty and actually cut the acrylic now! I would just suggest you to find a way to reinforce the attachment points of the pack. Plexiglass is brittle and it can probably fail if you encounter some bad roads. You dont want your wh...
by Dui, ni shuo de dui
Jun 03 2019 9:42pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Sabvoton 7260 strange throttle Control, pleas help
Replies: 13
Views: 285

Re: Sabvoton 7260 strange throttle Control, pleas help

Yesterday the weather was ok so i took it out for a ride. I set throt mid current down to 80A, and throttle control got much better, Good, at least this part is solved. but i had no chance to test at full speed, because it stopped totally, i think the BMS has blown. I can measure 57V on Controller ...
by Dui, ni shuo de dui
May 29 2019 10:33pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: 20KW 500AH/72v E Motorcycle
Replies: 7
Views: 451

Re: 20KW 500AH/72v E Motorcycle

With only 50Ah, at 20kw with a 72v pack, that's 20,000 / 72 = 278 amps. If it's kept at that 20kw power demand, then it will use up the battery in around 10 minutes. If the 20kw is only a burst of power every so often, then it could last a lot longer. Let's say it's only 10kw continuous, then that'...
by Dui, ni shuo de dui
May 29 2019 4:47am
Forum: Stand-up E-scooters and E-skateboards
Topic: Offroad Scooter recommendations?
Replies: 22
Views: 619

Re: Offroad Scooter recommendations?

Seen it, lovely ride to get around on but I wouldnt be jumping it through a rythem section on a downhill track anytime soon Well it's not really the intended use of the OP now, is it? He's just looking for a scooter for his GF to do some light off road on unpaved roads, not riding down the cliffs o...
by Dui, ni shuo de dui
May 29 2019 4:35am
Forum: E-Scooter and Motorcycle General Discussion
Topic: Sabvoton 7260 strange throttle Control, pleas help
Replies: 13
Views: 285

Re: Sabvoton 7260 strange throttle Control, pleas help

If both controllers had the same issue it is possible that the controller is not the problem. Might be the motor, sounds a bit like a short between phases. But I can't think of any reason why this would occur only in such specific conditions. That would also explain why your first controller blew u...
by Dui, ni shuo de dui
May 29 2019 2:41am
Forum: Stand-up E-scooters and E-skateboards
Topic: Offroad Scooter recommendations?
Replies: 22
Views: 619

Re: Offroad Scooter recommendations?

If you must have a scooter rather than a proper bike, go for a scooter with 20" wheels. Why you must have a scooter rather than a real bike is your own disability to deal with. Scooters are ok on short grass or dust paths etc at slow speed and fairly decent on an uneven tarmac road if you avoid maj...
by Dui, ni shuo de dui
May 29 2019 2:36am
Forum: E-Scooter and Motorcycle General Discussion
Topic: 20KW 500AH/72v E Motorcycle
Replies: 7
Views: 451

Re: 20KW 500AH/72v E Motorcycle

amberwolf wrote:
May 28 2019 11:50pm

just so you know, 500 / 32 = 15, so your new battery will weigh at least 15 times what your existing one does.
That was probably a typo, more likely to be 50Ah.
But yeah, more details and if possible accurate ones would be nice.
by Dui, ni shuo de dui
May 29 2019 2:22am
Forum: E-Scooter and Motorcycle General Discussion
Topic: Sabvoton 7260 strange throttle Control, pleas help
Replies: 13
Views: 285

Re: Sabvoton 7260 strange throttle Control, pleas help

Thanks for your Help!, About the Hall Test, i set the amps to 15A then start the Test, the Wheel turns slowly and in the App it shows status "in progress" after that it stops and says "Hall Test OK" then i save the settings, thats it, i think this should be fine. Seems fine, that's the correct proc...